Помогите пожалуста найти значения произведений 2\3*6\7 4\7*21\40 27\32*8\9

1) [latex] \frac{2}{3} * \frac{6}{7} = \frac{2*6}{3*7} = \frac{2*2}{1*7} = \frac{4}{7} [/latex] 2) [latex] \frac{4}{7} * \frac{21}{40} = \frac{4*21}{7*40} = \frac{1*3}{1*10} = \frac{3}{10} [/latex] 3) [latex] \frac{27}{32} * \frac{8}{9} = \frac{27*8}{32*9} = \frac{3*1}{4*1} = \frac{3}{4} [/latex]